Bubble and Squeak Recipe

Ingredients

• 4 tablespoons plus 4 teaspoons unsalted butter, divided
• 1/2 large yellow onion, chopped
• 1/2 small (about 8 ounces) green or Savoy cabbage, thinly sliced
• 1 bunch (about 8 ounces) lacinato kale, stemmed and thinly sliced
• 1/2 teaspoon salt, plus more to taste
• 1/4 cup water
• 2 cups leftover mashed potatoes
• 1 large carrot, coarsely grated
• 1/2 cup chopped parsley, plus more for garnish
• 1/8 teaspoon freshly ground black pepper
• 4 large eggs
• 2 cups halved cherry or grape tomatoes, for garnish (optional)